What does the “open” Sketch file format really mean
Steve Stone

Super, I got it from the header I read first time in your comment, the PK, this is a known prefix header for the pkZip format, and that means we will see many applications in the future that can open, parse the format and give you unlimited patch editing, even outside Sketch application :).
Thanks for Sharing,.

One clap, two clap, three clap, forty?

By clapping more or less, you can signal to us which stories really stand out.